Determining the size of the next UDP datagram in system's queue?

If I understand correctly, you just want to ensure that Buf doesn't overflow, but you don't care about any extra data beyond Size since you're discarding it anyway. In that case, all you need is this.

You can pop this datagram and calculate lenght of this, for get datagram existence information you can use select function, and for get all datagram you can use recv_from function with 64k buffer size agrument, then this function was result what you want.

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